Calculating Vector Rotations / James Saunders

Lead maintainer of of d3-x3d.

Published

Edited

Aug 31, 2019

test_x3dom = {

// x3dom

let fromVector = new x3dom.fields.SFVec3f(0, 1, 0);

let toVector = new x3dom.fields.SFVec3f(vx, vy, vz);

let qDir = x3dom.fields.Quaternion.rotateFromTo(fromVector, toVector);

let rot = qDir.toAxisAngle();

let rotation = [rot[0].x, rot[0].y, rot[0].z, rot[1]].join(' ');

return rotation;

}

test_mathGl = {

// math.gL

let fromVector = new mathGl.Vector3(0, 1, 0);

let toVector = new mathGl.Vector3(vx, vy, vz);

let qDir = new mathGl.Quaternion().rotationTo(toVector, fromVector);

let rotation = qDir.x + " " + qDir.y + " " + qDir.z + " " + qDir.w;

return rotation;

}

test_glMatrix = {

// gl-matrix

let fromVector = glMatrix.vec3.fromValues(0, 1, 0);

let toVector = glMatrix.vec3.fromValues(vx, vy, vz);

glMatrix.vec3.normalize(toVector, toVector); // rotationTo requires unit vectors

let quat = glMatrix.quat.create();

glMatrix.quat.rotationTo(quat, fromVector, toVector);

let out = glMatrix.vec3.create();

let ang = glMatrix.quat.getAxisAngle(out, quat);

return [...out, ang].join(' ');

}

x3dom = require('https://x3dom.org/download/dev/x3dom-full.js').catch(() => window.x3dom)

mathGl = require('https://bundle.run/math.gl@2.3.3')

glMatrix = require('https://bundle.run/gl-matrix@3.1.0')

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